Centrifugal pump



April 3, 1928. I 1,664,572

- o. POULSEN CENTRIFUGAL PUMP Original Filed May 10, 1 20 fi Ven C02Oscar PozzZseiz, By Me,

Patented Apr. 3, 1928.

AT'ES OSCAR roULs or ALAMEDA, oamronma.

cEN'rmFUGAL PUMP.

Application 'filed May 10, 1920, Serial;

This invention relates to centrifugal pumps and more especially to meansfor balancing the impeller therein, and keeping it centered in itscasing.

The invention may be best understood from an inspection of theaccompanying drawing, and the description thereof, which follows.

In the accompanying one sheet of drawing I have illustrated theinvention in its simplest form.

The figure shows a side elevation of a pump, the main body thereof beingsectioned to show the interior.

The pump is provided with a base 1 having bearings 2, 8, and mounted ona suitable foundation, not shown, to which it may be secured by bolts,as 4, 5 is the pump shaft, adapted to rotate in the bearings 2, 3, andhaving a drive pulley 6 thereon. The bearing at 3 is provided with abushing 7, a

gland 8 and packing 9. To a flange, or cars,

10 at the end of the bearing 3, is bolted the pump casing, 11,consisting of two central 26 sections substantially alike and boltedtogether and which has a discharge at 12, and

a suction at 13. To the discharge and suction, pipes 14 may be applied,leading to and from any desired points. To the end of shaft 5 is appliedthe impeller, rotated thereby, having the usual impelling channels 15,and the hub portions 16 and 17. The hub member 16 has the centralsuction opening 18, registering with the suction 13, and communicatingwith the impelling channels 15. The hub member 17 is provided with aseries of channels 19, extending axially through it. It will be observedthat the width, from end to end of the hubs, is less than the width ofthe casing, thus leaving narrow channels 20 and 21, which communicatewith the chambers 22 and 23, respectively, at the sides of the impeller.These channels are widened and narrowed by the lateral vibration of theimpeller.

The operation may be thus described. When the impeller shifts to theright, channel 20 is widened, and suction takes effect from chamber 22,and the pressure on that side of the impeller is reduced. At the sametime channel 21 is narrowed, and thereby suction from chamber 23 isreduced, and pressure on that side of the impeller is increased. Theimpeller, under the influence of these forces tends to the left. If theimpeller moves laterally too far to the left, the

No. 380,256; Renewed m rch 55, 1927..

reverse action of that, just described, takes effect. The impeller is bythis means balanced and centered in its casing.

Having thus described my invention, and an embodiment of it, in thefull, clear and exact terms required by law, and knowing that itcomprises novel, useful and valuable improvements in the art to which itpertains, I here state that I do not wish to be limited to the preciseconstruction and arrangement of the several parts, as herein set forth,as the same may be variously modified by a skilled mechanic withoutdeparting from the spirit of the invention.

lVhat I claim and desire to secure by Letters Patent of the UnitedStates, is the following, to wit 1. A centrifugal pump comprising incombination a casing, onsisting of two sections substantialy alike andsecured together, and having central annular por tions, a suction pipeprovided with a flange secured to the annular portion of one of saidsections and a bearing on the side opposite said suction pipe secured tothe annular portion of the other of said sections, an impeller centrallylocated within said sections, said impeller being spaced from the casingsections to provide a variable pressure chamber on each side ofsaidimpeller, said impeller having a uniform shaped hub on each sidethereof, and having their opposite extremities positioned internal tosaid an-' nular portions with a light clearance therebetween, one ofsaid hubs abutting said flange on said'suction pipe and the other havinglongitudinal channels therebetween abutting the bearing, the widthbetween the hubs being less than the width between the suction pipeflange and bearing, said flange, hubs and bearing, co-operating withsaid annular portions to form a chamber on each side of said hubs ofsubstantially the same diameter, surrounding the entire diameter of saidhubs and adapted to connect directly at one time one of said variablepressure chambers with the suction pipe.

.2. A centrifugal pump comprising in combination, a casing, consistingof two centrally disposed sections, a suction pipe provided with anannular flange secured to said casing on one side thereof and on theopposite side a bearing having an annular flange secured to said casing,an impeller mounted centrally in said casing to provide a variablepeller, a hub on each side of said impeller, passages, each one of saidpassages adapted one of said hubs having a central suction to connect atone time said pressure chamber 10 opening abutting said suction pipe andthe directly with the suction pipe.

other provided with a series of axial chan- In testimony that I claimthe foregoing nels abutting said bearing and the spaces I have heretoset my hand this 3 day of May, between said suction pipe and said suc-1920.

tion opening and between said axial ehannels and said'bearing beingprovided with OSCAR POULSEN.

